By JOE KAY
AP Sports Writer
CINCINNATI (AP) - The Pittsburgh Pirates' NL Central chances were hurt when Todd Frazier had a tying two-run homer in the seventh inning and Ramon Santiago hit a grand slam in the 10th, powering the Cincinnati Reds to a 10-6 victory on Saturday.
Pittsburgh started the day a game behind first-place St. Louis, which played at Arizona later. The Pirates have already clinched at least a wild card and would host that game on Wednesday.
Jordy Mercer homered, and Neil Walker drove in three runs with a bases-loaded single and a triple as the Pirates pulled ahead 6-4 but couldn't hold on.
John Axford (0-1) walked Frazier to open the 10th and gave up Chris Heisey's single and another walk with one out. Left-hander Bobby LaFromboise relieved, retired Bryan Pena on a shallow fly out, then gave up Santiago's first career grand slam.
Dylan Axelrod (2-1) retired the side in the top of the 10th.